// Copyright 2017, Google, Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
const {Spanner} = require('@google-cloud/spanner');

const spanner = new Spanner();

const instance = spanner.instance('quiz-instance');
const database = instance.database('quiz-database');
const answersTable = database.table('answers');

async function saveAnswer(
    { id, email, quiz, timestamp, correct, answer }) {
    const record = {
        answerId: `${quiz}_${email}_${id}_${timestamp}`,
        id,
        email,
        quiz,
        timestamp,
        correct,
        answer
    };

    try {
        console.log('Saving answer');
        await answersTable.insert(record);
    
    } catch (err) {
        if (err.code === 6 ) {
            console.log("Duplicate message - answer already saved");
        } else {
            console.error('ERROR processing answer:', err);
        }
    }

}
  

module.exports = {
    saveAnswer
};